A comparison of the changes in forced expiratory volume in one second due to exposure in the first working day in the week among them (80 workers) showed a greater reduction in byssinotics than among the others. Reduced maximum expiratory flow rates were found only in byssinotics. Independent of exposure, only third-grade byssinotic cases (22 out of 50) showed changes in predicted vital capacity, residual volume, total lung capacity, three seconds per cent vital capacity, total vital capacity timed in seconds, and air velocity index.

The pattern of changes in these lung functions is mostly obstructive; only two cases showed the pattern of restrictive disease.

This study denotes that two types of changes in pulmonary functions occur due to byssinosis. The first type is a temporary change in pulmonary functions which occurs only on exposure to the aetiological factor (cotton or flax dust). This type occurs among all grades of the disease. The nature of this type is obstructive. The second type of change is permanent. This type occurs only among the third grade of the disease and is not dependent on immediate exposure. This type of change is mostly obstructive but may show some restriction.

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